CN110015880B - Gypsum-based self-leveling material - Google Patents
Gypsum-based self-leveling material Download PDFInfo
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- CN110015880B CN110015880B CN201910425998.2A CN201910425998A CN110015880B CN 110015880 B CN110015880 B CN 110015880B CN 201910425998 A CN201910425998 A CN 201910425998A CN 110015880 B CN110015880 B CN 110015880B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a gypsum-based self-leveling material which comprises the following raw materials in parts by weight: 900 parts of modified gypsum waste, 200 parts of semi-hydrated gypsum, 220 parts of quartz sand, 10-13 parts of modified floating beads, 10-15 parts of redispersible latex powder, 1-1.5 parts of dispersing agent, 0.5-0.8 part of wetting agent, 0.8-1.3 parts of defoaming agent, 6-8 parts of water reducing agent, 1-1.5 parts of retarder and 0.4-0.7 part of water-retaining agent. The material has good leveling property; the gypsum waste is used as a main raw material, so that the resource utilization of the gypsum waste by-products is realized, the cost of self-leveling is reduced, and the damage of the gypsum waste to air, soil and water environment is reduced; the modified floating beads are added in the self-leveling, so that the wear resistance, heat insulation and fire resistance of the gypsum-based self-leveling are enhanced; the oven-dry breaking strength of the self-leveling can reach more than 12Mpa, and the oven-dry compressive strength can reach more than 27 Mpa.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a gypsum-based self-leveling material.
Background
Self-leveling is a leveling process, and self-leveling mortar is spread on the ground by utilizing the flowability of self-leveling mortar and flows freely to form a flat surface. The self-leveling mortar is safe to use, pollution-free, attractive, rapid in construction and practical, and is the characteristic of the self-leveling mortar. The method promotes civilized construction procedures, creates a high-quality, comfortable and flat space, and increases gorgeous colors for life by paving and pasting diversified standard decorative veneers. The self-leveling mortar has wide application, can be used for industrial factory buildings, workshops, warehouses, commercial stores, exhibition halls, gymnasiums, hospitals, various open spaces, offices and the like, and also can be used for households, villas, warm small spaces and the like. Can be used as a facing surface layer and a wear-resistant base layer.
The self-leveling gypsum-base mortar is a kind of dry powder mortar specially for leveling ground, which is prepared with gypsum material, special aggregate and various building chemical additives and through careful preparation and mixing. At present, the corresponding product standard established in China is JC/T1023-2007 gypsum-based self-leveling mortar.
The gypsum-based self-leveling is divided into alpha-semi-hydrated gypsum type and II type anhydrite type (obtained by calcining dihydrate gypsum at 650-750 ℃) according to raw materials, and the alpha-semi-hydrated gypsum type and the II type anhydrite type are both prepared by adding a small amount of auxiliary agents into the corresponding raw materials and uniformly mixing the auxiliary agents. The addition proportion of the additives is small and is below 1 percent, and the additives are common chemical products, so the essence of the self-leveling gypsum production technology is the production technology of alpha-hemihydrate gypsum or II type anhydrite. The alpha-hemihydrate gypsum type and the type II anhydrite type are self-leveling at higher cost.
The gypsum waste is industrial waste which takes calcium sulfate as a main component and can be divided into various types according to different sources of waste gypsum, waste residue generated by preparing phosphoric acid from phosphate ore and sulfuric acid is phosphogypsum, gypsum generated when preparing hydrofluoric acid from calcium fluoride and sulfuric acid is fluorgypsum, and gypsum generated by oxidizing after sulfur dioxide in coal-fired flue gas reacts with calcium hydroxide serving as a desulfurizing agent is changed into desulfurized gypsum. The main component of the gypsum waste is generally calcium sulfate dihydrate, the content of the gypsum waste can reach about 70-90%, and the gypsum waste also contains other impurities. A large amount of gypsum waste forms slag hills and seriously pollutes the environment. The production amount of the phosphogypsum is the largest, and the emission amount of the phosphogypsum in China is more than 2000 million tons every year at present, so that the phosphogypsum is the largest one of gypsum wastes.
Disclosure of Invention
The invention aims to provide a gypsum-based self-leveling material which takes gypsum waste as a main raw material and has good leveling property and strength, particularly excellent wear resistance and heat insulation property.
The purpose of the invention is realized by the following technical scheme:
the gypsum-based self-leveling material is prepared from the following raw materials in parts by weight:
preferably, the material consists of the following raw materials in parts by weight:
further, the preparation method of the modified floating bead comprises the following steps: adding 5 times of water by weight of the floating bead, adjusting the pH value to 7.5-8, dropwise adding a silane coupling agent accounting for 10% of the weight of the floating bead, stirring for reaction, and then filtering and drying to obtain the water-soluble glass.
Further, the silane coupling agent is one of KH550, KH560 and KH 570.
Further, the preparation method of the modified gypsum waste comprises the following steps: heating the gypsum waste for dehydration, grinding into powder, and sieving with a 100-mesh sieve.
Further, the dispersing agent is sodium polyacrylate, and the wetting agent is alkyl sulfate.
Further, the defoaming agent is a powder polyether type defoaming agent.
Further, the water reducing agent is a naphthalene high-efficiency water reducing agent.
Further, the retarder is citric acid.
Further, the water-retaining agent is hydroxypropyl methyl cellulose.
The gypsum-based self-leveling gypsum disclosed by the invention is prepared by taking gypsum waste as a main gypsum raw material and carrying out heating dehydration modification; the floating beads are hollow glass microspheres in the fly ash, the density of the hollow glass microspheres is less than that of water, the chemical components of the floating beads mainly comprise silicon dioxide and aluminum oxide, the floating beads are subjected to modification reaction by using a silane coupling agent, so that the floating beads can be uniformly dispersed in the gypsum self-leveling mortar, and due to the special hollow structure and chemical composition of the floating beads, the gypsum self-leveling mortar has excellent wear resistance, heat insulation and fire resistance.
The invention has the following beneficial effects:
the gypsum-based self-leveling material provided by the invention has good leveling property; the gypsum waste is used as a main raw material, so that the resource utilization of the gypsum waste by-products is realized, the cost of self-leveling is reduced, and the damage of the gypsum waste to air, soil and water environment is reduced; the modified floating beads are added in the self-leveling, so that the wear resistance, heat insulation and fire resistance of the gypsum-based self-leveling are enhanced; the oven-dry breaking strength of the self-leveling can reach more than 12Mpa, and the oven-dry compressive strength can reach more than 27 Mpa.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Raw materials in the embodiment of the invention can be purchased from the market, and a dispersant manufacturer in the embodiment is break-Thai chemical industry Co., Ltd, model HT-5050 polyacrylic acid sodium salt; a defoamer manufacturer, Defeng defoamer Co., Ltd, Dongguan city, model DF-230 powder polyether defoamer; water reducing agent manufacturers are FDN-B naphthalene series high-efficiency water reducing agents from Shandong Wanshan chemical Co.
The following examples use phosphogypsum as the main gypsum source, and the modification method is as follows: heating phosphogypsum at 150-160 deg.C for 2h, grinding into powder, and sieving with 100 mesh sieve.
The modification method of the floating bead comprises the following steps: adding 5 times of water by weight into the floating beads, uniformly stirring, adjusting the pH value to 7.5-8, then dropwise adding a silane coupling agent KH560 accounting for 10% of the weight of the floating beads, stirring for reaction for 30min, and then filtering and drying to obtain the product.
Example 1
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
600kg of modified phosphogypsum, 100kg of semi-hydrated gypsum, 150kg of quartz sand, 10kg of modified floating beads, 10kg of redispersible latex powder, 1kg of HT-5050 dispersant, 0.5kg of sodium dodecyl sulfate, 0.8kg of DF-230 defoamer, 6kg of FDN-B naphthalene-based high-efficiency water reducing agent, 1kg of citric acid and 0.4kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Example 2
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
650kg of modified phosphogypsum, 120kg of semi-hydrated gypsum, 160kg of quartz sand, 10.5kg of modified floating bead, 11kg of redispersible latex powder, 1.1kg of HT-5050 dispersant, 0.55kg of sodium dodecyl sulfate, 0.9kg of DF-230 defoamer, 6.4kg of FDN-B naphthalene high-efficiency water reducing agent, 1.2kg of citric acid and 0.45kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Example 3
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
700kg of modified phosphogypsum, 140kg of semi-hydrated gypsum, 175kg of quartz sand, 11kg of modified floating beads, 12kg of redispersible latex powder, 1.2kg of HT-5050 dispersant, 0.6kg of sodium dodecyl sulfate, 1kg of DF-230 defoamer, 6.8kg of FDN-B naphthalene-based high-efficiency water reducing agent, 1.2kg of citric acid and 0.5kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Example 4
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
750kg of modified phosphogypsum, 160kg of semi-hydrated gypsum, 190kg of quartz sand, 11.5kg of modified floating bead, 13kg of redispersible latex powder, 1.3kg of HT-5050 dispersant, 0.65kg of sodium dodecyl sulfate, 1.1kg of DF-230 defoamer, 7.2kg of FDN-B naphthalene high-efficiency water reducing agent, 1.3kg of citric acid and 0.55kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Example 5
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
800kg of modified phosphogypsum, 180kg of semi-hydrated gypsum, 200kg of quartz sand, 12kg of modified floating beads, 14kg of redispersible latex powder, 1.4kg of HT-5050 dispersant, 0.7kg of sodium dodecyl sulfate, 1.2kg of DF-230 defoamer, 7.6kg of FDN-B naphthalene series high-efficiency water reducing agent, 1.4kg of citric acid and 0.6kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Example 6
The gypsum-based self-leveling material is prepared by weighing the following raw materials in parts by weight:
900kg of modified phosphogypsum, 200kg of semi-hydrated gypsum, 220kg of quartz sand, 13kg of modified floating beads, 15kg of redispersible latex powder, 1.5kg of HT-5050 dispersant, 0.8kg of sodium dodecyl sulfate, 1.3kg of DF-230 defoamer, 8kg of FDN-B naphthalene series high-efficiency water reducing agent, 1.5kg of citric acid and 0.7kg of hydroxypropyl methyl cellulose.
And mixing the raw materials by using a stirrer to obtain the gypsum-based self-leveling material.
Comparative example 1
Essentially the same as example 1 except that no modified floating beads were added.
Comparative example 2
Essentially the same as in example 1, except that the unmodified floating beads were added.
The gypsum-based self-leveling materials of the examples and the comparative examples are taken, construction is carried out according to the water-cement ratio of 0.285, mortar performance test is carried out according to standard JC/T1023-2007 gypsum-based self-leveling mortar, the abrasion resistance and the abrasion resistance ratio of the mortar are detected according to GB/T169925-1997 concrete and product abrasion resistance test method and JC/T906-2017 cement-based abrasion-resistant material for concrete floors, and the thermal conductivity coefficient is detected according to GB50574-2010 wall material application unified technical specification. The results are shown in the following table.
As can be seen from the table above, all performance indexes of the embodiment of the invention all meet all regulations of JC/T1023-2007 Gypsum-based self-leveling mortar, and the addition of the modified floating beads can obviously improve the wear resistance of self-leveling and can also improve the heat insulation of self-leveling.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The gypsum-based self-leveling material is characterized by comprising the following raw materials in parts by weight:
600 portions and 900 portions of modified gypsum waste,
100-200 parts of semi-hydrated gypsum,
150 portions of 220 portions of quartz sand,
10-13 parts of modified floating beads,
10-15 parts of re-dispersible latex powder,
1-1.5 parts of a dispersing agent,
0.5 to 0.8 portion of wetting agent,
0.8 to 1.3 portions of defoaming agent,
6-8 parts of a water reducing agent,
1 to 1.5 parts of retarder,
0.4-0.7 part of water-retaining agent;
the preparation method of the modified floating bead comprises the following steps: adding 5 times of water by weight of floating beads, adjusting the pH value to 7.5-8, dropwise adding a silane coupling agent accounting for 10% of the weight of the floating beads, stirring for reaction, and then filtering and drying to obtain the silane coupling agent, wherein the silane coupling agent is one of KH550, KH560 and KH 570.
2. The gypsum-based self-leveling material according to claim 1, wherein the material is composed of the following raw materials in parts by weight:
750 parts of modified gypsum waste, namely,
160 parts of semi-hydrated gypsum, namely,
190 parts of quartz sand, namely quartz sand,
11.5 parts of modified floating beads,
13 parts of re-dispersible latex powder,
1.3 parts of a dispersing agent, namely,
0.65 part of wetting agent is added,
1.1 parts of a defoaming agent,
7.2 parts of a water reducing agent,
1.3 parts of a retarder,
0.55 part of water retention agent.
3. The gypsum-based self-leveling material according to claim 1 or 2, wherein the modified gypsum waste is prepared by: heating the gypsum waste for dehydration, grinding into powder, and sieving with a 100-mesh sieve.
4. The gypsum-based self-leveling material of claim 1 or 2, wherein the dispersant is sodium polyacrylate and the wetting agent is an alkyl sulfate.
5. The gypsum-based self-leveling material of claim 1 or 2, wherein the defoamer is a powder polyether defoamer.
6. The gypsum-based self-leveling material according to claim 1 or 2, wherein the water reducing agent is a naphthalene based high efficiency water reducing agent.
7. The gypsum-based self-leveling material of claim 1 or 2, wherein the set retarder is citric acid.
8. The gypsum-based self-leveling material according to claim 1 or 2, wherein the water retaining agent is hydroxypropyl methylcellulose.
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| CN116693321B (en) * | 2023-04-13 | 2024-05-10 | 重庆交通大学 | Preparation method of modified phosphogypsum-based self-leveling mortar |
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| CN107021718A (en) * | 2017-05-26 | 2017-08-08 | 济南惠泽新型建材有限公司 | A kind of lightweight aggregate Self-leveling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4725742B2 (en) * | 2007-02-19 | 2011-07-13 | 信越化学工業株式会社 | Hydraulic composition |
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| CN101250051A (en) * | 2008-01-31 | 2008-08-27 | 上海中绿建材有限公司 | Gypsum terrace material |
| CN107021718A (en) * | 2017-05-26 | 2017-08-08 | 济南惠泽新型建材有限公司 | A kind of lightweight aggregate Self-leveling |
| CN107382246A (en) * | 2017-07-31 | 2017-11-24 | 湖北萨利赫新材料有限公司 | With brushing gypsum for eliminating formaldehyde, releasing negative oxygen ion and preparation method thereof |
| CN108083753A (en) * | 2018-01-12 | 2018-05-29 | 深圳摩盾环保新材料有限公司 | A kind of gypsum base is without sand mold machine spray lightweight plastering material and preparation method thereof |
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